Lock mechanism for automatic pistols



J. DECLAYE. LOCK MECHANISM FOR AUTOMATIC PISTOLS.

APPLICATION FILED IN. 25. 192i.

I 1,434,328.. Patented m 31, 1922.

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2/ fi uuaw J, DECLAYE. LOCK MECHANISM FOR AUTOMATIC PISTOLS.

APPLICATION FlhED MAR. 25. I92!- 1,434, 32 8. Patented Oct. 31, 1922.

Patented Get. 31, 1922.

PATENT w s.

JOSEPH DECLAYE, 0F LIEGE; BELGIUM.

LOCK MECHANISM FOR AUTOMATIC PISTOLS.

Application filed March 25, 1921. Serial No. 455,569.

To all whom it may concern Be it known that I, JOSEPH DEOLAYE, a subject of the King of Belgium, residing at Liege, 32 Rue Adolphe Borgnet, Belgium, have invented certain new and useful Improvements in Look Mechanismfor Automatic Pistols (for which I have filed an application in Belgium, May 2, 1918) and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of references marked, which form a part of this specification.

The present invention relates to lock mechanism for automatic pistols comprising a hammer which, after the trigger is pulled,

strikes the firing-pin so as to efiect the firmg.

The invention relates particularly to arms in which the hammer carries a scar Which, when the arm is cooked, is supported on a solid part of the body and from which it is removed, in order to permit of the firing taking place, by a rod operated by the trigger. This rod in order to displace the sear, must overcome the action of a spring. arranged between this sear and the hammer.

This spring is arranged so that the sear constitutes an escapement member during the cocking of the arm.

In the arrangement according to the present invention the lock spring acting on the hammer is utilized so as also to exercise on the sear an action identical with that which is exercised by the spring in the known arrangement which is disposed between the hammer and the sear and which can, therefore, be dispensed with.

With this object the lock spring acts on the hammer, through the medium of the sear, in a direction such that this sear itself is submitted to an action in the desired direction.

The accompanying drawings represent by way of example one method of carrying out the invention. In these drawings:

Figure 1 represents a perspective view, partly in section, of the principal parts of the lock mechanism.

Figure 2 is a partial section through a pistol the parts being shown in the cocked position. v i

Figure 3 represents these parts in the positions they assume during firing.

Figure 4 represents the position of the parts during cooking.

Figure 5 represents the parts in the cocked position, when the firer has not yet released the trigger. I

Figure 6 shows how it is impossible for firing to take place when the bolt is not fully in place.

The hammer 1 pivoted at 2' on the body 3 carries, pivoted at 8, the sear 5 whose foot 6 is supported, in the cocked position, on a member 7 solid with the body 8. On the sear 5 is pivoted at 4 the link 9, subjected to the action of the spring 10. This link comprises a slot 11 engaged by the aforesaid pivot 8 so that the said link is not obstructed by this pivot 8 in its movements about pivot 4.

When the trigger (not shown in the drawings) is pulled, the end 12 of the rod 13-connected to the trigger pushes the foot 6 .of the sear 5 and causes it to turn about its pivot '8. The sear 5 transmits the action of the spring 10 to thehammer 1 through its pivot 8 and since its foot 6 is not supported by the part 7, the hammer, under the influence of the spring 10, falls by turning about its pivot 2 and takes with it the sear 5 pivoted on it at 8. The parts then occupy the position shown in Figure 3 in which the hammer 1 is in contact with the firing pin 14.

In the position represented in Figure 2, the action of the spring 10 on the hammer is exerted on the line x Y in the position of the parts represented in Figure 3 this action is exerted on the line 00 Y It will be seen that the distance of the pivot 2 from the line 00 Y is considerably greater than the distance of the pivot 2 from the line a Y, and that, consequently, the force required to cause the hammer to move towards the cocked position is relatively small, whilst it is considerably increased during firing.

Moreover, when the hammer is engaged with the firing pin, Figure 3, the relatively great force exerted by the spring 10 has the effect of greatly assisting to maintain the 1 breech closed during firing.

Figure 4 represents the position of the parts during the recoil of the breech slide at the moment when the foot 6 of the sear comes upon the end 12 of the bar 13 which covers the part 7 so long as the finger of the firer has notreleased the trigger. Fig ure 5 represents the position of the parts when the foot 6 takes its support on the end 12 of the bar 13. 'At this moment the sear 5, under the influence of the spring 10, has turned about its pivot 8 until its head 15 abuts against the face 16 of hammer 1.

While this rotation of the sear 5 is taking place about its pivot 8 its head 15 moves in a groove 17 in the base of the slide 18.

Figure 6 shows that if the pistol has not been completely closed, the, disengagement of the sear cannot take place, because its head 15 abuts against the slide at 19. By examining Figure 2 it will be seen that when the pistol is fully closed the disengagement 1 of the sear 5 can properly take place.

The lock mechanism according tothe present lnvention consists of an assemblage of parts represented particularly 1n F lgure l and they can be introduced simultaneously into the body after having been assembled as shown in Figure 1 What I claim is:

l. A look mechanism for an automatic pistol having a trigger, comprising a hammer, a spring for operating said hammer, a member rigid with the body of the pistol,

, a sear pivoted to said hammer and urged towards said rigid memberby said spring,

said sear resting upon said rigidmember when the pistol is cocked and thereby preventing the operation of the hammer by said spring, and a pusher member operated by the trigger, said pusher member having its extremity slidable upon said rigid member for engaging and displacing the sear from said rigid member, the sear moving over said extremity and resting upon it, upon the automatic cooking of the pistol, until said pusher member moves to normal position upon release of the trigger.

2. A lock mechanism for an automatic pistol having a trigger, comprising a hammer, a spring for operating said hammer, a member rigid with the body of the pistol, a scar pivoted to said hammer and connected by a link to said spring by which it is urged towards said rigid member, said sear resting upon it upon the automatic cooking of the pistol, until said pusher member moves to normal position upon release of the trigger, and an abutment limiting displacement of the sear with relation to the hammer.

3. A lock mechanism for an automatic pistol comprising a hammen'a sear pivoted upon it, a member rigid with the body supportin the sear when the arm is cooked, a member operated by the trigger for displacing the sear from the fixed member, so as to allow the release of the hammer, a head provided on said'sear, a breech slide having a groove permitting the displacements of the said head, and an abutment provided in the rear part of the groove" against which the head of the sear abuts when the breech slide is not fully closed.

In testimony whereof I aflix my signature in presence of two witnesses.

JOSEPH DEOLAYE.

Witnesses GEORGE VANDER HAEGHEN. CHARLES Mnnonm. 

